/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package net.dreamlu.iot.mqtt.codec;

import org.tio.core.intf.Packet;

/**
 * Base class for all MQTT message types.
 *
 * @author netty
 */
public class MqttMessage extends Packet {
	private final MqttFixedHeader mqttFixedHeader;
	private final Object variableHeader;
	private final Object payload;
	private final DecoderResult decoderResult;

	// Constants for fixed-header only message types with all flags set to 0 (see
	// https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Table_2.2_-)
	public static final MqttMessage PINGREQ = new MqttMessage(new MqttFixedHeader(MqttMessageType.PINGREQ, false,
		MqttQoS.AT_MOST_ONCE, false, 0));

	public static final MqttMessage PINGRESP = new MqttMessage(new MqttFixedHeader(MqttMessageType.PINGRESP, false,
		MqttQoS.AT_MOST_ONCE, false, 0));

	public static final MqttMessage DISCONNECT = new MqttMessage(new MqttFixedHeader(MqttMessageType.DISCONNECT, false,
		MqttQoS.AT_MOST_ONCE, false, 0));

	public MqttMessage(MqttFixedHeader mqttFixedHeader) {
		this(mqttFixedHeader, null, null);
	}

	public MqttMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader) {
		this(mqttFixedHeader, variableHeader, null);
	}

	public MqttMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader, Object payload) {
		this(mqttFixedHeader, variableHeader, payload, DecoderResult.SUCCESS);
	}

	public MqttMessage(
		MqttFixedHeader mqttFixedHeader,
		Object variableHeader,
		Object payload,
		DecoderResult decoderResult) {
		this.mqttFixedHeader = mqttFixedHeader;
		this.variableHeader = variableHeader;
		this.payload = payload;
		this.decoderResult = decoderResult;
	}

	public MqttFixedHeader fixedHeader() {
		return mqttFixedHeader;
	}

	public Object variableHeader() {
		return variableHeader;
	}

	public Object payload() {
		return payload;
	}

	public DecoderResult decoderResult() {
		return decoderResult;
	}

	@Override
	public String toString() {
		return "MqttMessage[" +
			"fixedHeader=" + (fixedHeader() != null ? fixedHeader().toString() : "") +
			", variableHeader=" + (variableHeader() != null ? variableHeader.toString() : "") +
			", payload=" + (payload() != null ? payload.toString() : "") +
			']';
	}
}
